12x02 Mamma Mia. This kills me. While Mary thinks that John was a great father, Dean knows that's not necessarily true. He was a good drill sergent, but father, not so much. John loved his sons, there is no question there, but when it came to being a father, he wasn't there for them the way he should have been and Mary really has no idea what those boys have been through with John. Its shaped their entire lives.